can any body help mesolve it i know the solutionis tbut i can't find the equation answer or how to finish it lease to you give me theanswer when i was at schooli wasno good at maths i struggled with my multilication tabless

I'm not entirely sure what you're asking since you said "i know the solutionis"

To anyone who needs some help with this ...

As the hints point out, C is 3 times the value of A

The hints also point out that C is 2 times the value of B

This being the case, C must be a single digit number that is divisible by both 2 and 3

Once you have C (there's only one number it can be), the rest just falls into place

As usual, players can see the answer here if they need it
http://professorlaytonwalkthrough.blogspot.com/2008/11/puzzle010uk.html

what is the 4 digit number i have to put in to get the answer

As mentioned, the link given above has the answer if you need it

But it's really not that difficult and you should try to solve it

To help you out even more, the single digit number that is divisible by both 2 and 3 is 6 (or in other words, C is 6)

And knowing that C is 6, the rest is simple

A plus 6 = D
A times B = 6
6 minus B = B
A times 4 = D

To start with, the third equation shows that B must be half of 6, which then gives you A, which then gives you D